Multiple recorder



Aug. 29, 1939. w. D. ANDERSON MULTIPLE RECORDER Filed Oct. 5, 1936 3' sheets-fsheet 1 lnventbhz Warren D. Anderson His Atbo 29, 1939. w. D. ANDERSON MULTIPLE RECORDER 3 Sheets-$heet 2 Filed Oct. 3, 1936 fl w PM P o o m dw W5A .m m Ws Aug. 29, 1939. w. b. ANDERSON MULTIPLE RECORDER 3 Sheets-Sheet 3 Filed Oct. 3, 1936 Inventor: -War-r-en D. Anderson, 25 9% 6A7 His Att'orn g5.

Patented Aug. 29, 1939 2,171.3 -MULTIPLE aacoanna' Warren D. Anderson, Bridgeport, Conn, alllgnor to General Electric Company, a corporation of New York Application October 3, 1936, No. 123,884

12 Claims. (Cl. 234-67) My invention relates to recording instnmients of the type which produce records of a number of quantities or events on the same chart and I the object of my invention is to provide simple 5 recording mechanism by means of which selected diflerent records made on the same chart may be readily distinguished,

In carrying my invention into effect, I make use of a recording stylus oi the type which is normally removed from the record sheet or chart to eliminate friction and is momentarily brought in contact with the chart at the instant of making a record. I take advantage of the movement of the stylus to and from the chart to change its marking surface in such a way that consecutive-records produced thereby can be readily distinguished from each other. plished, for example, by using a stylus which makes an elongated mark and rotating the stylus by means of a ratchet mechanism so that consecutive records have their elongated axes at distinguishing angles to each other.

The features 01' my invention which are believed to be novel and patentable wlllbe pointed out in the claims appended hereto. For a better understanding of the invention, reference is made in the following description to the accompanying drawings in which Fig. 1 shows the general structure of recorder to which my invention is applied; Fig. 2 is an enlarged view of a marking stylus embodying my invention; Fig. 3 represents a portion of a record sheet on which six difierent records have been made by means of the present invention; Fig. 4 shows portions of a recording demand meter and its record sheet, illustrating the use of the invention to record maximum demand .by means of individual records whichalso show by their nature the time at which made.

Fig. 5 shows a form of stylus for producing=a number of diilerent records which are distinguished from each other and which also show the hour and minute when made. Fig. 6 is view of the marking face 01 the stylus of Fig. 5 and Fig. 'I is a portion of a record sheet on which records have been made by the stylus of Fig. 5.

Reierring now to Fig. 1, an electrical-measuring instrument It is arranged to have its energizing circuit successively connected to four thermocouples ll, l2, l3, and I4, through four pairs of switch contacts l5, l6, l1, and i8. One wire I! of the instrument It is a common wire to one side of all of the thermocouples and the other wire 20 of the instrument is a common wire.

to one contact 01' each oi the four switches. The other sides of the four thermocouples are sepa- This can be accomrateiy connected to the other contacts oi. the 'respective switches. A timing motor 2i is provided to rotate the cam member 22, which thus causes successive closure of the four sets of contacts for a short period of time.

Let it be assumed that the cam 22 makes a revolution once per hour. At the instant, represented in the drawings, thermocouple I4 is connected to instrument ll through switch contacts l8, which are closed for a few minutes. This allows ample time for the instrument III to deflect and give a measurement of the temperature existing at such thermocouple. About 15 minutes after contacts ll close, contacts l5 close and momentarily connect thermocouple ill to the measuring instrument. In turn, thermocouples l2 and II are momentarily connected to the instrument through contacts at l6 and i1, respectively, and thus, during every hour, the same instrument measures the temperature at the iocations of the different thermocouples.

The instrument I! is provided with a recording arm 23 and it swings from a zero indication from one edge of a recording chart 24 over the chart but out of contact therewith to a point determined by the temperature measurement being made. During the time any one of the thermocouple circuits is closed and after the instrument has had time to reach a steady deflection, a striker arm 2! descends momentarily, carries the stylus shown at 26 with it, and causes the stylus to produce a mark on the record sheet 24 indicative of the temperature measurement. For this purpose, a carbon ribbon 21 may be provided between the stylus and record chart so as to leave an imprint of the stylus on the chart 24. To

A ratchet operated by an electromagnet 32 is provided to advance the chart 24 between recording operations and, for this purpose, electromagnet 22 may be momentarily energized through contacts 28, also closed at the proper times by cam ll. Since the chart should be advanced when no recording operation is being performed,

. fifteen minutes, on the same recording chart.

The main purpose of the present invention is to distinguish the diiierent records so as to be able to see at a glance which records belong to the different thermocouples and, for this purpose, the stylus at 26 is made in a special form, one embodiment being illustrated in Fig. 2. Fig. 2 also shows the relation of the stylus with respect to the recording. chart 24, carbon ribbon 21, and the striker arm 25, when the stylus is free to swing.

The stylus has a downward extending central portion integral or rigidly secured to the 'end of the pen arm 23. About the upper portion is a sleeve part 36, which may slide up and down on part 35 to the limited extent permitted by the dimensions of an elongated slot 31 through which the arm 23 extends to join the central part 35. Thegupper end of the sleeve 36 is closed by an end section 38, which is the portion contacted by the striker arm 25 when it descends in making a record.- A spring 33 keeps the sleeve 36 in its upper position, shown when in the idle condition. A ratchet pawl 46 is pivoted at 4| from one side of thesleeve and hangs down below the bottom outside skirt of the sleeve. Gravity keeps the pawl against a stop pin 42 when in the idle condition. Just below the lower end of the pawl is a second sleeve 43 which has ratchet teeth 44 cut in its upper edge. The ratchet sleeve is free to rotate on part 35 and to move up and down thereon within certain limits. A spring 45 surrounds the lower end of part 35 below the ratchet 1 sleeve and'the ratchet sleeve normallyrests upon the upper end of this spring. The spring is fastened at 46 to 35 at its lower end at about the point where the stylus part 35 starts to taper to a blunt marking point 41 which is centered with the axis of the stylus.

The ratchet sleeve has a marking foot 48 extending downward from one side outside of spring 45 such that, when the ratchet sleeve is pressed downward and spring 45 is compressed, the foot 48 will move down in line with-the marking point 41 and cooperate in making the record, the're'cord being distinguished by the rotative position of part- 43 with respect to the central point .41.

The number of ratchet teeth 44 will vary with the number of distinguishing marks to be made 'in succession. In the illustration of Fig. 2, there are six evenly-spaced teeth about the upper edge The parts as shown in Fig. zrepresent the idle condition of the stylus, that is, when the striker arm 25 is raised therefrom. when a record is to bemade, the operation of the stylus is substantially as foll6ws:"""

Arm 25 descends and strikes sleeve part 13, which immediately starts to slide downward n part 35, compressing the relatively weak spring 39. Sleeve 36 is held from rotation by the extension of arm 23 through slot 31. Ratchet pawl 46 moves against the cam surface of a ratchet tooth and causes sleeve 43 .to rotate in the direc- 5 tion indicated by the arrow thereon, which is a l clockwise direction looking downward towards the chart.) At this time, the ratchet sleeve is free to turn because there has as yet been very little downward movement of the stylus as a 10 whole and there is little compression of spring 45. Thus, the initial operation is largely a downward movement of sleeve 36 and a rotary movement of ratchet sleeve 43, although some slight down-' ward movement of the stylus as a whole may 00- 15 our at this time. The ratchet sleeve rotates onesixth of a revolution and no farther because the point of pawl 40 reaches the bottom of a slot and checks further rotation and then springis compressed and sleeve 43 descends on part 35. 20

By this time, part 35 is moving downward due to compression of both springs 39 and 45 or contact of arm 23 with the upper end of slot 31 or both, and parts 41 and 48 press the carbon paper 2? against chart 24 and produce a record both as 25 to the recording position of the stylus arm with respect to the zero line of the chart and as to, the rotative position of part 48 about the central recording p'oint 4'8. The sleeve 43 ,wiil have rotated part 48 one-sixth revolution from the posi- 39 tion shown by the time the record is made.

The reciprocating motion of striker arm 25 towards and away from the chart is brief and, as it rises, sleeves 36 and 43 rise to the positions shown although more slowly than the sleeve parts, pawl 40 is free and swings slightly to the left in clearing the rear undercut part of tooth 44 and, when clear of its upper point, swings slightly to the right due to gravit' against pin 42 in po- 40,

shown, central part 35 also rises to the position 5;

24, Fig. 3, at 50. For succeeding recording op- 45 erations, in the order of their occurrence, as the recording part 48 rotates clockwise in steps of one-sixth revolution each, records like those shown at 5|, 52, 53, 54, and 55 will be produced and then a record like 50 again. It is evident 50 that all of the records like 50 can be easily distinguished from all of the remaining records and this is true of each distinctive type of record re gardless ofthe mixing of the difierent records over the width of the record sheet. For example.

in Fig. 3, it is easilyseen that the line of records corresponding to mark 5| crosses the line of records corresponding to mark 52 twice in the sample record illustrated. Referring again to Fig. 1, distinctive records of the same character are shown v at Ila, I211, Na, and Ma, corresponding, respectively, to the temperatures registered at thermocouples li, l2, l3, and I4.

- -It is evident from the character of the recording marks shown that there are four evenly- 05 spaced teeth on the recording stylus 26 of Fi 1 I and that its distinguishing marker makes onefourth revolution per recording operation. In using a six-mark stylus like that of Fig. 2, we

would change the commutating arrangement for 7p the circuits controlled by the timing motor accordingly. It is feasible to make use of only a portion of available distinguishing marks. For example, in Fig. 1, if we disconnected thermocouple II, we would still obtain proper records which they were made.

of the other thermocouples and we would have in addition a line of records marking the zero line like the marks Ha.

In addition to distinguishing the records for the difierent measurements corresponding to thermocouples II to l4, inclusive, or such other devices as may be connected in place thereof, the records may also serve to indicate the time at It was assumed above that the cam 22 of Fig. 1 made one revolution per hour. If now, the contacts l8 and 38 are set to close at fifteen minutes past the hour, the records l4a made at this time indicate by the position of that elongated portion of the mark made by the rotary marking part '48 the position of the minute hand of a clock when fifteen minutes past the hour. Fifteen minutes later, namely, at half past the hour, contacts at l5 close, the marks Ha are made, and it will be noted that the adjustable elongated portion of such marks indicate the position of the hour hand of a clock for half past the hour. At a quarter to the hour, marks l2a are made and, on the hour, marks I30. are made, both of which show by the rotary position of the distinguishing portion thereof the time at which made in accordance with the well known minute hand position of a clock at corresponding times. In the six-tooth ratchet stylus of Fig. 2 and the records made thereby (Fig. 3), the records could be made every ten minutes and at the times indicated by that position of the recorddistinguishing foot 48 simulating a minute hand of a clock. The direction of rotation of the marker 48 is clockwise, looking down at the record made thereby. Thus, if record 58 is timed to occur at twenty-five minutes past the hour and the device makes six operations per hour, records 5| to 55, inclusive, will be made at minute indications given thereby, simulating the position of the minute hand of a clock. Thus,

' records 55 are made at fifteen minutes past the hour.

In Fig. 4, I have shown a maximum demand recorder wherein my invention is employed to produce demand records which. show by\ their character the times during the hour at which made. In this figure, 58 represents an integrating meter or equivalent device, the demand of which, over predetermined time intervals, it is desired to measure and record. The meter is connected through gearing 5| to rotate the recording arm 28 with its stylus 25 from a zero line 82 on chart 53 to the right in accordance with the rotary demand of meter 50. The gearing ,5l includes a gear 54 which may be de-. meshed at predetermined intervals. When the'arm 28 is being advanced, a spring 55 is wound up such that, when gear 54 is demeshed, the spring 55 returns the arm 28 with its stylus 25 to a zero position with the stylus over zero line 52. For demeshing gear 54, it is mounted on a pivoted armature 58 of an electromagnet 81. The electromagnet is momentarily energized every fifteen minutes through contacts 58 when they are closed by a cam 58 driven by a timing motor 18. The motor lll also advances the chart 58 through a gear drive H and drum 34. The recording stylus 25 ordinarily swings free of the chart but, at the end of each demand interval just before the gear 54 is demeshed, the striker arm 25 is operated by electromagnet 28 to momentarily force the stylus 25 in contact with the chart to record its position with respect to is made before gear 54 is demeshed and the arm '23 starts to return to zero.

It is assumed that the cam 88 rotates once every fifteen minutes and that the records are made accordingly whereby the demand is recorded over each fifteen-minute interval, also that the stylus 25 has a four-tooth ratchet and a distinguishing marker part that rotates one-fourth revolution for each recording operation. It will thus produce records of four different types as indicated at 12, 13, I4, and 15. If now the rotary position of the stylus 25 and cam 58 be initially adjusted so that records 12 are made on the hour, the records will show by the position of the distinguishing portion thereof'the times when made, the distinguishing part of each rec-' ord simulating the minute hand of a clock. Thus records 14 are made at half past the hour. The maximum and minimum demands for that part of the record illustrated occurs at a quarter to and a quarter after the hour, respectively. If the hour marks be applied at the margin of the chart, the exact time of occurrence day or night for each record is easily determined.

In Fig. 5, I have shown a modification of my invention which is arranged to designate both the hour and the minute of the making of a plurality of different records by the same instrument on the same record sheet. In Fig. 5, T5 designates the outer end of the stylus arm of a recording instrument such as is shown in Fig. 1 or 3. Integral or secured to the end of this arm is a hollow sleeve portion 11 having a reduced portion I8 at its lower end. The extreme lower por- L tion of the reduced portion 18 is threaded for a nut 18. The threads are preferably left hand to prevent unscrewing the nut when the device is in operation should the nut become loose. Between nut 18 and the shoulder of the part 11, there is rotatively supported a ratchet marker having, for example, six evenly-spaced teeth in its upper edge. One of the teeth 8! has a face which is cut considerably deeper than the remaining five teeth. This rotary ratchet marker is provided with a marking shoe 82 which extends downward outside and clear of nut 19. The marking surface of this foot is long and narrow and pointsserves to rotate a second rotary marker 84 which .I 60

extends through the axis of the sleeve 11 and is securely fixed to ratchet 83. The lower end of marker 84 has a marking surface shaped like a short pointer with a large hub, as shown in Fig. 6, the center of the hub being on the axis of the stylus. The pointer of this marker is sufiiciently short as to freely swing past the inner end of marking shoe 82.

It, will now be evident that shoe 82 may be used to simulate the minute hand of a clock and shoe 84 the hour hand of a clock. Pivotally mounted at 85 on the outside of sleeve 12 is a three-armed lever 85. One arm extends downward and carries a pivoted ratchet pawl 81 just .above the Bit toothed surface of ratchet 80, which cooperates with such ratchet. The upwardly extending arm of lever 06 has a sleeve 80 extending to the rear over the top of ratchet 83 and ashait 89 extendin; through this sleeve, to which is fixed a pawl 90 over the far tooth surface of ratchet 03. The near end of shaft 80 has an arm 8i fixed thereto extending in the same direction as pawl 90 and a link member 92 is pivoted between the.outer end of arm and pawl 01 such that pawls l1 and .00 must rise and fall together. When pawl l'l rests in any one of the shallow depressions of ratchet 80, it holds ratchet 80 above the toothed surface of ratchet 03 through link 92, arm 0!, and shaft 80. However, when pawl 01 falls into the deep notch behind tooth 8i, pawl 90 is lowered so that it can operate ratchet 03. Stop pins 03 and 04 are provided to limit the reciprocating motion of the three-armed lever 80 and the throw of pawls Bl and 00. It will be noted that the upper arm to pawl is shorter than the lower arm to pawl Bl, also that, in a ratchet-advancing operation of the lever t6, the pivot point of the upper pawl rises slightly while the pivot point of pawl 01 is lowered slightly. The throw oi the upper pawl 90 is thus shorter than the throw of pawl 0'? and the parts are so proportionedthat the throw of the two pawls is such as to advance their ratchets only one tooth. The lower ratchet 00 is thus advanced one tooth or one-sixth revolution while the upper ratchet 83 is advanced, ii at all, one-twelfth revolution. However, due to the fact that ratchet E3 is advanced only when pawl 0? falls into the deep slot of ratchet 80, the lower ratchet makes s. complete revolution for each one-twelfth revolution of the upper ratchet.

The third of lever 00 extends along the marking arm l6 a short distance and has a turned-up portion which rises slightly above arm 38 in line with the striker arm 25. A spring 96 is provided to return the three-armed lever 86 and the parts connected thereto to the position shown when strilier arm 25 is lifted. The carbon paper 2?! and chart 2d are indicated in spaced relation to the stylus as they will be when the stylus arm is tree to swing. tion of the parts represented.

The particularstylus represented in Fig. 5 is intended to record six different measurements on one record sheet per hour. The records produced will not only distinguish the measurement recorded but also the hour and minute of recording it the timing motor which controls the recorder. is accurate and is properly set and the stylus markhas parts fiil end 82 are set with the hour and minute hands oi an accurate clock.

For example, let us suppose the recorder is set up ready ior operation and the time is lithe. Marking part 86 will be adjusted to the position of the hour hand of a clock when pointing to .11. Marking part will be adjusted tothe position oi the hour handof a clock when it is ten n in: utes to on the hour. The timing cam corresponding to cemEZ of Fig. l willloe adjusted to This is the condiclose the reneesurlngcircidt which it is desired to ace parts 3d contacts shout marlring foot 02 end the ratchet 0i.

' so adjusted and there v in big.

At 12:00 o'clock, the markers 02 and 84 will'be advanced to the 12:00 o'clock positions, and record 01 will be produced; at 12:10, record 98 will be produced Just after marker 82 only is advanced; and so on records 89, I00, IN, and I02 being produced at 12:20, 12:30, 12:40, and 12:50, respectively. At 1:00, record 91a will be produced. These records, by the position of the marks made by parts 82 and 84, indicate the time when made. Records 91 and 81a are records of measurements made on the same circuit and so identified by the similar position of the minute-indicating mark. The remaining records are similarly identified both as to time when made and the measurements recorded and, of course, the position of these marks irom the zero line of the chart indicate the magnitude ofthe quantity recorded.

erring again to Fig. 5, in order that the hour ratchet 08 be rotated when the minutemarhing foot advances from the fifty-minute position to the enact hour-minute position, it is necessary that the deep notch in ratchet 80 be in a promr position with respect to the minutealso depend on which direction is assumed to be up when looking at the chart. In the position shown, in Figs; 5 and 6 let it he assumed that, when the depression bar is next operated, the minute marker 02 will advance from the 3:40 time position to the 3:50 time position. During such operation, only ratchet 80 is operated because ratchet pawl lid is maintained in the raised inoperative position shown and, consequently, marker 06 remains in the 3:00 oclocls position. After bar 20 has been depressed far enough to operate the ratchet mechanism, it strikes arm 70 and forces lcoth markers 02 and 80 so that the imprint of their positions are made on the record sheet 2 3. Depressor bar now raises. Arm' l0 first raises 'andfinally spring 06 returns the ratchet lever 06 to the retracted position shown. Now pawl 0V drops in the deep slot behind tooth @i and allows pawl 00 to drop down behind a tooth in ratchet 88 so that on the next operation ratchet advances marker 82 from the 3:50

time position to the 12:00 o'clock position at the e time marker 00 is rotated one-twelfth revolution to the lzilll o'clock hour-hand position. Rotation of both markers is clockwise, looking down on the chart. The relative position of marker 32 and the deep slot in its ratchet are thus shown correctly in Fig. 5 for the six-tooth minute ratchet and the other conditions assumed.

Where the pen or stylus arm of the recording instrent is relatively short and it swings over,

a considerable are, the orientation of the time indicating marks with respect to any given stht line of the record sheet will vary appreciahly. For example, a twelve ocloclr indicating record may have the ute and hour extensions of the record pointing towards the pivot point or the recording arm and straight up on the record sheet when the stylus is in the center of the chert. When the stylus swings to the right side of the chart, the time-indicating extensions will naturally he oriented to the left of the straight up position by an amount equal to the angle through which the pointer has swung. However, these indicating marks will still point towards 'oivot point of thereccrding instruis twelve ocloclr. Hence the ientation will not he confusing if. ed that regardless oi where the on the chart, the twelve o'clock the ease sued, is towards the pivot rec-ord app position, in

This will.

For instance in Fig. '7 it is normal to the curved lines drawn across the record sheet with pivot joint of the pen arm as a center.

It is evident that the stylus is in eifect a time stamp and performs the function of a time stamp as well as the other functions previously mentioned;

It would, of course, be possible to use each of the seventy-two consecutive distinguishing marks made by the stylus of Fig. for recording seventy-two different events or measurements. For instance, the recording operation could be speeded up to record every fifty seconds such that the seventy-two diiferent. records would be produced every hour.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention together with the apparatus which I now consider to represent the best embodiment thereof but I desire to have it understood that the apparatus shown is only illustrative and that the invention may be carried' out by other means.

What I claim as new and desire to secure by Letters Patent pf the United States, is:

1. A recording instrument comprising, a recording chart, a recording arm movable over said chart, a record-making stylus on said arm, means for momentarily depressing said stylus to produce a record on said chart, said stylus having a record-distinguishing marking member which is movable on said stylus to different recording positions to distinguish between different records made by said stylus, and means on said stylus operated when said stylus is depressed to produce a record for changing the recording position of said marking member on said stylus.

2. A recording instrument comprising, a recording chart, a recording stylus movable over said chart but normally out of contact therewith,

a depressor bar arranged to be'reciprocated to ill) momentarily depress said stylus and produce a' record on said chart, said stylus having a marking member which is movable on said stylus to different recording positions, and means on said stylus positioned to be contacted by said depressor bar when reciprocated in a recording operation for changing the recording position of said marking member on said stylus.

3. A recording instrument comprising, a recording chart, a recording stylus movable over said chart in response to a measurement to be recorded but normally out of contact with said chart, means for momentarily pressing said Stylus against the-chart to make a record, said stylus having a marking member which is rotatable about the axis of the stylus in the plane of the chart, and means on said stylus operated in .respouse to the movement of said stylus towards and away from said chart for rotating said marking member by an even fraction of v 360 degrees. .4. A recording instrument comprising,'a recording chart, a recording stylus movable over said chart in response to a measurement to be recorded but normally out of contact with said chart, means for momentarily pressing said stylus against the chart to make a record, said stylus having a two-part marking member, one part of which is movable with respect to the other on said stylus to different recording positions,

"and a ratchet on said stylus operated by the means for pressing the stylus against the record sheet for changing the recording position of the movable part of said marking member on the stylus.

5. A recording instrument comprising, a record sheet, a stylus supported above said record sheet and normally out of contact therewith, means for momentarily depressing the stylus against the record sheet to make a record, said stylus having a marking point on its central axis and a marking finger which is rotatable about the central axis to diiferent recording positions, both of said marking parts producing the record when the stylus is depressed, and means operated in response to the depressing operation of said stylus for rotating said marking finger an even fraction of 360 degrees for each such operation.

6. In a recording instrument, a recording stylus normally supported out of recording position, said stylus comprising a central part with a marking point at one end, a second marking part rotatively mounted about the central part, a ratchet wheel integral with said second marking part having a bearing on the central part, a sleeve slidable on said central part having a ratchet pawl cooperating with said ratchet wheel, and means for momentarily moving said stylus into recording position, which means engages said sleeve in said movement and moves the sleeve to reciprocate the pawl and rotate the ratchet wheel.

7. In 'a recording instrument, a recording stylus comprising a central cylindrical part with a recording point at one end, a sleeve rotatively mounted on the cylindrical part adjacent the recording and and a sleeve slidably mounted on the opposite end, the rotary sleeve having ratchet teeth in the end facing the slidable sleeve and a marking finger extending from its opposite end, the slidable sleeve having a ratchet pawl extending towards and in line with the ratchet teeth in the rotatable sleeve, resilient means for moving the slidable sleeve away from the rotatable sleeve, said stylus being resiliently mounted for endwise movement and normally out of recording position, and means which engages the slidable sleeve and slides it towards the rotary sleeve to operate the ratchet, rotate the marking finger, and move the stylus as a whole endwise into recording position when a record is tobe made.

8. A recording instrument of the type forconsecutively recording a number of different measurements on the same record sheet comprising, a record sheet, a measuring instrument having a recording arm and stylus which is moved over the record sheet in response to the measurement being made, means for connecting the measuring instrument for the different measurements, means for momentarily moving the stylus into recording engagement with said sheet, timing means for controlling said measurement-connecting and stylus-moving operations whereby records of the different measurements are made consecutively andat predetermined time intervals, said stylus being provided with a record-distinguishing marker which is rotatable about the axis of the stylus to as many different positions as there are different measurement records to be made, and means on said stylus operated in response to the movement of said stylus to and from recording engagement for consecutively rotating said marker to its different recording positions, said marker simulating the hand of a clock as regards direction of rotation and time of rotation, whereby the records produced not only distinguish the records of different measurements but also indicate the time at which made.

9. A recording instrument comprising, a record sheet, a stylus movable over said sheet in response to a measurement to be recorded, said stylus being normally out of recording contact with said sheet but momentarily movable into recording engagement therewith to produce measurement records, said stylus including a rotatable time-in- 10. A recording instrument comprising a record sheet, a stylus movable over and normally out of contact with said record sheet in accordance with measurements to be recorded, and means for periodically moving said stylus into recording engagement with said record'sheet, said stylus also comprising a time stamp having relatively movable time designating recording pointers thereon, the relative movement of said pointers being accomplished by operation of the means for periodically moving the stylus into recording engagement with the record sheet, whereby the m ment records produced also indicate the time at j which made.

11. In a recording instrument, a recording arm, a time stamp stylus adapted to be mounted on said recording arm, said time stamp stylus having a rotary hour hand marker and a rotary minute hand marker, ratchet wheels for operating said markers, pawls for operating said ratchets,

connectingsaid pawls and influenced by the depth of the teeth in the minute hand ratchet for preventing operation of the hour hand ratchet except as the minute hand ratchet completes a revolution, a depressor bar for momentarily depressing said recording arm at predetermined time inter-v vals to make a record, said lever having a part which is engaged and moved by said depressor bar as it is depressed in a recording operation, and a spring for returning said lever to the position from which moved when the depressor bar is lifted.

12. A recording instrument comprising, a rec- 0rd sheet, a time stamp normallymemoved from the record sheet, a depressor bar for operating said time stamp and momentarily pressing it into recording engagement with said record sheet to produce time records at predetermined time in tervalaand a measuring instrument for moving said time stamp over said chart in response to measurements to be recorded thereby.

WARREN D. s

a common lever for operating said pawls, means I 

